nali, as far as RS goes I certainly get your point. All the other major sellers make it easy to filter to "show in stock itemsonly", RS doesn't let you know whether something is in stock until you click and open its own page.
Also, whilst I haven't found it impossible to find things on those sites... has anyone else found it very annoying that they (all of the usual ones) don't properly "curate" the numbers on different items. When you want to filter for say, H-bridges and show results with a certain range of maximum currents you get "2A" and "2000mA" and "2 A" and "2A DC" and 2000 mA typical" all as options in the drop down list, and they aren't even next to each other. And you can only select either one value to filter by, or a range of values next to each other in the drop down list. So if you want to see everything with a max current of 1A to 4A, you have to select the 1A 1.5A, 2A, 2.7A, 3A, 4A filter. Then clear this and look at 1000mA ,..,..,4000mA, and repeat for those where they've left extra spaces in, or included the letters DC... You'd think when they add a new product to their sites they would always put it in units to match those already listed.